1 /* Support for printing Java values for GDB, the GNU debugger.
3 Copyright (C) 1997-2016 Free Software Foundation, Inc.
5 This file is part of GDB.
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program. If not, see <http://www.gnu.org/licenses/>. */
24 #include "expression.h"
35 java_value_print (struct value *val, struct ui_file *stream,
36 const struct value_print_options *options)
38 struct gdbarch *gdbarch = get_type_arch (value_type (val));
39 enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
44 struct value_print_options opts;
46 type = value_type (val);
47 address = value_address (val);
49 if (is_object_type (type))
52 struct value *tem = val;
54 /* Get the run-time type, and cast the object into that. */
55 while (TYPE_CODE (value_type (tem)) == TYPE_CODE_PTR)
56 tem = value_ind (tem);
58 obj_addr = value_address (tem);
62 type = type_from_class (gdbarch, java_class_from_object (val));
63 type = lookup_pointer_type (type);
65 val = value_at (type, address);
66 type = value_type (val);
70 if (TYPE_CODE (type) == TYPE_CODE_PTR && !value_logical_not (val))
71 type_print (TYPE_TARGET_TYPE (type), "", stream, -1);
73 name = TYPE_TAG_NAME (type);
74 if (TYPE_CODE (type) == TYPE_CODE_STRUCT && name != NULL
75 && (i = strlen (name), name[i - 1] == ']'))
79 unsigned int things_printed = 0;
82 = java_primitive_type_from_name (gdbarch, name, i - 2);
85 read_memory (address + get_java_object_header_size (gdbarch), buf4, 4);
87 length = (long) extract_signed_integer (buf4, 4, byte_order);
88 fprintf_filtered (stream, "{length: %ld", length);
93 CORE_ADDR next_element = -1; /* Dummy initial value. */
95 /* Skip object header and length. */
96 address += get_java_object_header_size (gdbarch) + 4;
98 while (i < length && things_printed < options->print_max)
103 alloca (gdbarch_ptr_bit (gdbarch) / HOST_CHAR_BIT));
104 fputs_filtered (", ", stream);
105 wrap_here (n_spaces (2));
108 element = next_element;
111 read_memory (address, buf, sizeof (buf));
112 address += gdbarch_ptr_bit (gdbarch) / HOST_CHAR_BIT;
113 /* FIXME: cagney/2003-05-24: Bogus or what. It
114 pulls a host sized pointer out of the target and
115 then extracts that as an address (while assuming
116 that the address is unsigned)! */
117 element = extract_unsigned_integer (buf, sizeof (buf),
121 for (reps = 1; i + reps < length; reps++)
123 read_memory (address, buf, sizeof (buf));
124 address += gdbarch_ptr_bit (gdbarch) / HOST_CHAR_BIT;
125 /* FIXME: cagney/2003-05-24: Bogus or what. It
126 pulls a host sized pointer out of the target and
127 then extracts that as an address (while assuming
128 that the address is unsigned)! */
129 next_element = extract_unsigned_integer (buf, sizeof (buf),
131 if (next_element != element)
136 fprintf_filtered (stream, "%d: ", i);
138 fprintf_filtered (stream, "%d..%d: ", i, i + reps - 1);
141 fprintf_filtered (stream, "null");
143 fprintf_filtered (stream, "@%s", paddress (gdbarch, element));
151 struct value *v = allocate_value (el_type);
152 struct value *next_v = allocate_value (el_type);
154 set_value_address (v, (address
155 + get_java_object_header_size (gdbarch) + 4));
156 set_value_address (next_v, value_raw_address (v));
158 while (i < length && things_printed < options->print_max)
160 fputs_filtered (", ", stream);
161 wrap_here (n_spaces (2));
173 set_value_lazy (v, 1);
174 set_value_offset (v, 0);
177 set_value_offset (next_v, value_offset (v));
179 for (reps = 1; i + reps < length; reps++)
181 set_value_lazy (next_v, 1);
182 set_value_offset (next_v, value_offset (next_v)
183 + TYPE_LENGTH (el_type));
184 value_fetch_lazy (next_v);
185 if (!value_contents_eq (v, value_embedded_offset (v),
187 value_embedded_offset (next_v),
188 TYPE_LENGTH (el_type)))
193 fprintf_filtered (stream, "%d: ", i);
195 fprintf_filtered (stream, "%d..%d: ", i, i + reps - 1);
199 common_val_print (v, stream, 1, &opts, current_language);
207 fprintf_filtered (stream, "...");
209 fprintf_filtered (stream, "}");
214 /* If it's type String, print it. */
216 if (TYPE_CODE (type) == TYPE_CODE_PTR
217 && TYPE_TARGET_TYPE (type)
218 && TYPE_TAG_NAME (TYPE_TARGET_TYPE (type))
219 && strcmp (TYPE_TAG_NAME (TYPE_TARGET_TYPE (type)),
220 "java.lang.String") == 0
221 && (options->format == 0 || options->format == 's')
223 && value_as_address (val) != 0)
225 struct type *char_type;
226 struct value *data_val;
228 struct value *boffset_val;
229 unsigned long boffset;
230 struct value *count_val;
234 fputs_filtered (" ", stream);
236 mark = value_mark (); /* Remember start of new values. */
238 data_val = value_struct_elt (&val, NULL, "data", NULL, NULL);
239 data = value_as_address (data_val);
241 boffset_val = value_struct_elt (&val, NULL, "boffset", NULL, NULL);
242 boffset = value_as_address (boffset_val);
244 count_val = value_struct_elt (&val, NULL, "count", NULL, NULL);
245 count = value_as_address (count_val);
247 value_free_to_mark (mark); /* Release unnecessary values. */
249 char_type = builtin_java_type (gdbarch)->builtin_char;
250 val_print_string (char_type, NULL, data + boffset, count, stream,
258 common_val_print (val, stream, 0, &opts, current_language);
261 /* TYPE, VALADDR, ADDRESS, STREAM, RECURSE, and OPTIONS have the
262 same meanings as in cp_print_value and c_val_print.
264 DONT_PRINT is an array of baseclass types that we
265 should not print, or zero if called from top level. */
268 java_print_value_fields (struct type *type, const gdb_byte *valaddr,
270 CORE_ADDR address, struct ui_file *stream,
272 const struct value *val,
273 const struct value_print_options *options)
275 int i, len, n_baseclasses;
277 type = check_typedef (type);
279 fprintf_filtered (stream, "{");
280 len = TYPE_NFIELDS (type);
281 n_baseclasses = TYPE_N_BASECLASSES (type);
283 if (n_baseclasses > 0)
285 int i, n_baseclasses = TYPE_N_BASECLASSES (type);
287 for (i = 0; i < n_baseclasses; i++)
290 struct type *baseclass = check_typedef (TYPE_BASECLASS (type, i));
291 const char *basename = TYPE_NAME (baseclass);
292 const gdb_byte *base_valaddr;
294 if (BASETYPE_VIA_VIRTUAL (type, i))
297 if (basename != NULL && strcmp (basename, "java.lang.Object") == 0)
302 if (options->prettyformat)
304 fprintf_filtered (stream, "\n");
305 print_spaces_filtered (2 * (recurse + 1), stream);
307 fputs_filtered ("<", stream);
308 /* Not sure what the best notation is in the case where there is no
310 fputs_filtered (basename ? basename : "", stream);
311 fputs_filtered ("> = ", stream);
313 base_valaddr = valaddr;
315 java_print_value_fields (baseclass, base_valaddr,
316 offset + boffset, address,
317 stream, recurse + 1, val, options);
318 fputs_filtered (", ", stream);
322 if (!len && n_baseclasses == 1)
323 fprintf_filtered (stream, "<No data fields>");
328 for (i = n_baseclasses; i < len; i++)
330 /* If requested, skip printing of static fields. */
331 if (field_is_static (&TYPE_FIELD (type, i)))
333 const char *name = TYPE_FIELD_NAME (type, i);
335 if (!options->static_field_print)
337 if (name != NULL && strcmp (name, "class") == 0)
341 fprintf_filtered (stream, ", ");
342 else if (n_baseclasses > 0)
344 if (options->prettyformat)
346 fprintf_filtered (stream, "\n");
347 print_spaces_filtered (2 + 2 * recurse, stream);
348 fputs_filtered ("members of ", stream);
349 fputs_filtered (type_name_no_tag (type), stream);
350 fputs_filtered (": ", stream);
355 if (options->prettyformat)
357 fprintf_filtered (stream, "\n");
358 print_spaces_filtered (2 + 2 * recurse, stream);
362 wrap_here (n_spaces (2 + 2 * recurse));
365 annotate_field_begin (TYPE_FIELD_TYPE (type, i));
367 if (field_is_static (&TYPE_FIELD (type, i)))
368 fputs_filtered ("static ", stream);
369 fprintf_symbol_filtered (stream, TYPE_FIELD_NAME (type, i),
371 DMGL_PARAMS | DMGL_ANSI);
372 annotate_field_name_end ();
373 fputs_filtered (": ", stream);
374 annotate_field_value ();
376 if (!field_is_static (&TYPE_FIELD (type, i))
377 && TYPE_FIELD_PACKED (type, i))
381 /* Bitfields require special handling, especially due to byte
383 if (TYPE_FIELD_IGNORE (type, i))
385 fputs_filtered ("<optimized out or zero length>", stream);
387 else if (value_bits_synthetic_pointer (val,
388 TYPE_FIELD_BITPOS (type,
390 TYPE_FIELD_BITSIZE (type,
393 fputs_filtered (_("<synthetic pointer>"), stream);
397 struct value_print_options opts;
399 v = value_field_bitfield (type, i, valaddr, offset, val);
403 common_val_print (v, stream, recurse + 1,
404 &opts, current_language);
409 if (TYPE_FIELD_IGNORE (type, i))
411 fputs_filtered ("<optimized out or zero length>", stream);
413 else if (field_is_static (&TYPE_FIELD (type, i)))
415 struct value_print_options opts;
416 struct value *v = value_static_field (type, i);
417 struct type *t = check_typedef (value_type (v));
419 if (TYPE_CODE (t) == TYPE_CODE_STRUCT)
423 common_val_print (v, stream, recurse + 1,
424 &opts, current_language);
426 else if (TYPE_FIELD_TYPE (type, i) == NULL)
427 fputs_filtered ("<unknown type>", stream);
430 struct value_print_options opts = *options;
433 val_print (TYPE_FIELD_TYPE (type, i),
435 offset + TYPE_FIELD_BITPOS (type, i) / 8,
436 address, stream, recurse + 1, val, &opts,
440 annotate_field_end ();
443 if (options->prettyformat)
445 fprintf_filtered (stream, "\n");
446 print_spaces_filtered (2 * recurse, stream);
449 fprintf_filtered (stream, "}");
452 /* See val_print for a description of the various parameters of this
453 function; they are identical. */
456 java_val_print (struct type *type, const gdb_byte *valaddr,
457 int embedded_offset, CORE_ADDR address,
458 struct ui_file *stream, int recurse,
459 const struct value *val,
460 const struct value_print_options *options)
462 struct gdbarch *gdbarch = get_type_arch (type);
463 struct type *target_type;
466 type = check_typedef (type);
467 switch (TYPE_CODE (type))
470 if (options->format && options->format != 's')
472 val_print_scalar_formatted (type, valaddr, embedded_offset,
473 val, options, 0, stream);
476 addr = unpack_pointer (type, valaddr + embedded_offset);
479 fputs_filtered ("null", stream);
482 target_type = check_typedef (TYPE_TARGET_TYPE (type));
484 if (TYPE_CODE (target_type) == TYPE_CODE_FUNC)
486 /* Try to print what function it points to. */
487 print_address_demangle (options, gdbarch, addr, stream, demangle);
491 if (options->addressprint && options->format != 's')
493 fputs_filtered ("@", stream);
494 print_longest (stream, 'x', 0, (ULONGEST) addr);
501 /* Can't just call c_val_print because that prints bytes as C
503 if (options->format || options->output_format)
505 struct value_print_options opts = *options;
507 opts.format = (options->format ? options->format
508 : options->output_format);
509 val_print_scalar_formatted (type, valaddr, embedded_offset,
510 val, &opts, 0, stream);
512 else if (TYPE_CODE (type) == TYPE_CODE_CHAR
513 || (TYPE_CODE (type) == TYPE_CODE_INT
514 && TYPE_LENGTH (type) == 2
515 && strcmp (TYPE_NAME (type), "char") == 0))
516 LA_PRINT_CHAR ((int) unpack_long (type, valaddr + embedded_offset),
519 val_print_type_code_int (type, valaddr + embedded_offset, stream);
522 case TYPE_CODE_STRUCT:
523 java_print_value_fields (type, valaddr, embedded_offset,
524 address, stream, recurse, val, options);
528 c_val_print (type, valaddr, embedded_offset, address, stream,
529 recurse, val, options);